The meetings were held at the request of White House chief of staff John KellyJohn Francis KellyMORE, and stressed the importance of avoiding even so much as the appearance of unethical behavior, according to CNN.

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The agencies were also reportedly given guidelines, titled "creating a culture of compliance." The advice outlined in that document highlighted the importance of "optics," saying that officials should refrain from behavior that could appear outside their agency's mission.

A number of Cabinet-level officials in the Trump administration have faced scrutiny amid questions dealing with ethical behavior.

Pruitt faced backlash over first-class travel on official trips, while Zinke's travel is the subject of investigations by the Office of Special Counsel and the Interior Department's inspector general.

Carson has also come under fire for purchasing a $31,000 table for his office, an order he canceled last week, while a trip to Europe by Shulkin last summer was the subject of an inspector general's report. That report found that the VA secretary misused government resources.